Operating Leases, Total Net Lease Costs (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020
Net Lease Costs [Abstract]
Operating lease cost		$ 5,652	$ 6,286	$ 18,898	$ 19,346
Variable lease cost		449	1,004	1,700	3,122
Short-term lease cost		34	0	214	0
Sublease income		(181)	(180)	(526)	(519)
Total net lease cost	[1]	$ 5,954	$ 7,110	$ 20,286	$ 21,949

[1] Total net lease cost does not include those costs included in Restructuring and Related Charges on our Unaudited Condensed Consolidated Statements of Income. See Note 9, “Restructuring and Related Charges” for more information on these programs.